Years ago in a BD article, George Breedlove, one of pbt's best breakers at the time, mentioned that he didn't break the balls with his hardest stroke. Instead, he said he broke the balls at roughly 75-80%. He also mentioned at one time that while playing Buddy, he dislocated his shoulder after a break and asked Buddy to pop it back in, which he declined to do. In another forum years ago, I remember reading about a match between Charlie Williams and Mizerak in which Charlie broke the balls harder than usual, even though he was losing the cueball, but still won the match anyways. So the questions are, how hard do you break the balls, what are the results, and what determines how hard you break them?